Slab form



July 11 192%.

L. L. ELDRIDGE SLAB FORM Filed May 28. 2 fimwus-Shwm 2 Patented .1 My 1,, 19241 LEONARD L. ELDRIIDGE, 013 SAN ANTONIO, TEXAS.

SLAB

Application filed May 28,

To all whom it may concern:

Be it known that I, LEONARD L. ELDRIDGE, a citizen of the United States, residing at San Antonio, in the county of Bexar and State of Texas, have invented certain new and useful Improvements in Slab Forms, of which the following is a specification.

This invention relates to new and useful improvements in forms for molding building slabs.

The object of the invention is to provide a form which is particularly adapted for casting a building slab or wall element having a general T-shape in cross section and reinforced in a particular manner.

One of the objects of the invention is to provide a bulkhead for the end of the form whereby an interlocking tongue is provided on each end of the slab.

A further object of the invention is to provide a form comprising two longitudinal separable members which may be readily removed and which are particularly adapted to support the central reinforcing element.

A still further object of the invention is to provide a form in which slabs of intermediate lengths may be readily cast. Another feature of the invention is the provision of marginal members which form guides for finishing off the slabs.

A construction designed to carry out the invention will be hereinafter described together with other features of the invention.

The invention will be more readily understood from a reading of the following specification and by reference to the accompanying drawings, in which an example of the invention is shown, and wherein:

Fig. 1, is an isometric view showing a plurality of forms in assembled position,

Fig. 9., is a plan view of one of the forms with the reinforcing elements placed therein,

Fig. 3, is a longitudinal vertical sectional view of the same,

Fig. 1, is a detail showing the manner of tying the reinforcing elements together,

Fig. 5, is an enlarged longitudinal sectional detail showing one end of the form with a completed slab therein,

Fig. 6, is an isometric view of one of the form members,

Fig. 7 is a perspective view of one of the slabs which is cast in the form,

FORM.

1923. Serial No. 641,935.

Fig. 8, is an enlarged transverse sectional view showing a completed slab in the form, and,

Fig. 9, is an enlarged transverse sectional view of one of the slabs.

In the drawings the numeral 10 designates an elongated form member, of which two are required for each form. Each member has a substantially rectangular shape in cross section and may be made in any suitable manner although it is preferable to make the same in an integral piece. Each member has a rib 11 along its inner side contiguous to its bottom edge. Along the upper outer edge of each member is provided a longitudinal flange 12, which projects above the upper surface of the member. The flange has its inner face or side 13 cut back or inclined so as to overhang the top of the member. The function of the inclined face 13 is to form a bevel on the longitudinal edge of the slab which is cast in the form.

As before stated each form comprises two members 10 which are placed with their ribs 11 in juXta-position. This provides a transverse casting space which is T-shaped in cross section. In each end of the form I place a bulkhead 14 which has its ends beveled to fit the faces 13 and is provided with a shank 15 depending between the members and resting upon the ribs 11. It is obvious that the plastic material such as cement will not flow into the space occupied by the bulkhead, but may flow under the horizontal or transverse portion thereof. The purpose of this bulkhead is to produce a projecting tongue at each end of the slab which is formed by extending the stem or web ofthe slab under the transverse portion of the bulkheads.

In order that a substantial slab may be cast it is necessary to reinforce the same. For this purpose an element 16 formed of large meshed wire fabric may be disposed vertically in the casting space with its lower ends extending down between the ribs 11 as is shown in Figs. 3, 5 and 8. The vertical web or element 16 is tied at its up or edge to a transverse reinforcing web 1 which has its outer ends 17 bent down to extend under the flanges 12. The web 17 is terminated short of the ends of the web 16 so as to provide space for the bulkheads. When it is desired to cast a short slab one of the bulkheads is moved inwardly of the form as is shown in Fig. 1.

In using, the molds or forms a suitable base 18 of boards or other material is provided and retaining strips 19 are fastened at each end. The first form member 10 is placed against one of the strips 19 and then the web 16 is placed in position and the second form member 10 laid on the base and moved toward the firstmember, whereby the lower ends of the web are clamped :between the r-ibs 11. The rest of the form members are thus placed until the space between the strips is filled. The bulkheads Hare placed in position with the shanks fitting snugly between the members 10. The transverse webs 17 are placed in the molds and the webs 16 are tied thereto. The molds are now in position to receive the plastic material. The method of assembling the molds which has just been described may be varied or altered asp-found convenient.

.The wet plastic material is poured or otherwise introduced into the forms and will lodge inthe T-shaped spaces. The webs l6 and17 will-thus be embedded in the slabs. The'tops of the slabs may be finished in a'nysuitable manner, the tops of the flanges 1.2 forming guides for a straight-edge. After-the slabs are dry the bulkheads 14 may be removed and the forms disassembled in anyconvenient way for removing the slabs. The molds may be cleaned and used again.

Thesimplicity and flexibility of the molds is a very valuable feature. Various changes in the size and shape of the parts as well as modifications and alterations may be made within the scope of the appended claims,

VVhat-I claim, is;

1.. In a slab molding form, a pair of longitudinal members, each having a marginal overhanging flange for forming a bevelled edge and a longitudinal rib, the member forming a T-shap'ed casting space with the .ribs at the'bottom thereof- .and bulkheads .fittingin the-casting space for forming the ends of the slab cast in said space.

2. In a slab molding form, a pair of longitudinal members, each having a top marginal flange having its inner side out under at an inclination to the. perpendicular and a .2

flat top below the flange, each member hav-- ing a vertical inner side and a lateral rib extending longitudinally at the bottom thereof.

3. In a slab molding form, a pair of longitudinal members forming a T-shaped molding space therebetween, said members having means at the bottom of the T-shaped space for clamping an upright reinforcing element there-between, and bulkheads having portions overhanging the vertical legs of the molding spaces and fitting between the members forming projecting lugs on each end of the slabs.

4-. In slab molding form, a pair of longitudinal members forniing a T-shaped molding space there-between. said members having means at the bottom of the T-shaped space for clamping an upright reinforcing element there-between and inclined flanges on the upper outer edges of theu'iembers for forming bevelled edges on the slabs.

5.111 a slab molding form, a pair of longitudinal members forming a T-shaped molding space there-between, said members having longitudinal ribs at the bottom of the molding space for clamping an upright rein forcing element there-between. longitudinal flanges along the upper outer edges of the members having inclined inner faces for forming bevelled edges on the slabs, and T shaped bulkheads fitting in the molding spaces and having transverse portions overhanging the vertical portion of the molding space.

6. In a slab molding form, a base, retaining elements fastened to the base, pluralit of longitudinal molding members arranged in pairs and secured on the base between the retaining elements, the members of each pair forming an elongated T-shaped molding space there-between. and T-shaped bulkheads fitting in the molding spaces for torming projecting lugs on each end of the slab.

In testimony whereof I aiiix my signature.

LEONARD L. ELDRIDGE. 

